This all seems like great advise.
I don't think that our ABF is eating to his fill, but we have been experimenting a bit. I found a white bug in the earth the other day, Bubbles gobbled him up, it was funny to see because for about a minute it looked like he had a big white smile. I tried to get a photo but no luck.
This morning we found a few worms and he also gobbled that up. We also found a slug of some sort, but he was not able to scoop it into his mouth so we removed it from the tank.